EP2207937A1 - Procédé et système pour identifier des scènes dans un espace de détection - Google Patents

Procédé et système pour identifier des scènes dans un espace de détection

Info

Publication number
EP2207937A1
EP2207937A1 EP08848121A EP08848121A EP2207937A1 EP 2207937 A1 EP2207937 A1 EP 2207937A1 EP 08848121 A EP08848121 A EP 08848121A EP 08848121 A EP08848121 A EP 08848121A EP 2207937 A1 EP2207937 A1 EP 2207937A1
Authority
EP
European Patent Office
Prior art keywords
infrared
signal sequence
transmitter
infrared transmitter
receiver
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08848121A
Other languages
German (de)
English (en)
Other versions
EP2207937B8 (fr
EP2207937B1 (fr
Inventor
Mark Ebert
Volkmar Norkus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micas AG
Original Assignee
Micas AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Micas AG filed Critical Micas AG
Publication of EP2207937A1 publication Critical patent/EP2207937A1/fr
Application granted granted Critical
Publication of EP2207937B1 publication Critical patent/EP2207937B1/fr
Publication of EP2207937B8 publication Critical patent/EP2207937B8/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/05—Arrangements of devices on wash-basins, baths, sinks, or the like for remote control of taps
    • E03C1/055—Electrical control devices, e.g. with push buttons, control panels or the like
    • E03C1/057—Electrical control devices, e.g. with push buttons, control panels or the like touchless, i.e. using sensors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
    • G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
    • G01S17/04—Systems determining the presence of a target

Definitions

  • the invention relates to a method and an arrangement for the identification of scenes in a detection space by means of infrared radiation, preferably for use as an infrared proximity switch for automatically controlling the flow of water in washstand fittings.
  • the method enables a spatially and temporally resolved detection of these scenes, making it particularly suitable for all proximity switches that need to switch safely under difficult conditions.
  • Active infrared systems for detecting stationary or moving objects in a specific detection space are well known. Examples include infrared proximity switches, as they are commonly used in washbasin taps and Handtrocknem, and infrared light barriers or curtains, which are used primarily in the security technology.
  • an infrared transmitter and an infrared receiver are usually arranged close to each other and capture optically according to their opening angle a certain area of space.
  • the infrared transmitter transmits a modulated radiation into this spatial area. If an object is located in this area, the radiation is reflected by the object surface and hits the receiver, which generates a corresponding output signal. If the scene changes within the detection range of the components as the object moves (magnitudes and / or emissivity change) or new objects are added, this results in a change in the signal level at the output of the receiver.
  • the signal change is used to trigger switching or control pulses.
  • a disadvantage of such systems is that they measure integrally over the entire detection space. As a result, the identification of a scene, i. h., the spatially resolved detection of objects and their temporal change in the detection space hardly possible.
  • the proximity switch is mainly housed in the valve.
  • the scene which takes place at a distance of about 15-45 cm from the proximity switch in the fitting, is characterized by a time-constant scene formed by the washbasin, parts of the fitting and the background, and a temporally changing scene, the Through the upper body of a person at the sink, the hands under the water spout and the incipient jet of water is caused.
  • the incipient water jet can vary greatly depending on the pervator used in its geometry and its internal structure.
  • the jet may have a relatively small diameter (eg less than 20 mm) with a relatively dense internal structure or a bulge-like shape with a large width (eg greater than 50 mm) with a relatively transparent own internal structure.
  • a relatively small diameter eg less than 20 mm
  • a relatively dense internal structure e.g., a relatively dense internal structure
  • a bulge-like shape e.g., a large width
  • a relatively transparent own internal structure e.g., there are also additional reflections in the sink and parts of the fitting.
  • conventional infrared proximity switches often result in faulty circuits in faucets with large beam widths or when using well-reflective pelvic materials in the near infrared range. Conventional infrared proximity switches are therefore unsuitable for such applications.
  • DE 19744 319 A1 discloses a device for monitoring rooms against unauthorized access, which has an infrared transmitting device, an infrared receiving device and an evaluation device for comparing the received infrared signal with a reference signal.
  • the device comprises means for modulating the infrared transmit signal at a first modulation frequency and for modulating the received infrared signal at a second modulation frequency.
  • the evaluation device the phase difference is calculated from the first and second modulation signals for detecting the transit time of the modulated infrared signal. frequency mixed reference signal and the modulated received signal.
  • EP 1 324 071 A2 proposes a method and a device for detecting objects within a detection range, in which an infrared light signal is emitted by a transmitter and detected after reflection on an object by means of a receiver. In order to avoid misinterpretations, different detection ranges are monitored successively by a change in the emitted and / or detected signal level.
  • DE 197 21 105 C2 presents an optoelectronic sensor which has a light transmitter for emitting a transmitted light bundle into a monitoring area and a light receiver for receiving the received light bundle.
  • the light receiver consists of a multi-element light sensor with at least four individual sensor elements which are arranged such that different sensor elements are acted upon by the received light bundle depending on the beam angle and the evaluation unit comprises means by which the sensor elements of the multi-element light sensor in a variable manner can be subdivided into sensor areas.
  • the invention has for its object to find a method that makes it possible with simple means to identify scenes in detection spaces location or time resolved and that guarantees a safe switching when certain scenes.
  • the method should be used for the automatic control of water flow in washbasin faucets.
  • the arrangement for carrying out the method should be miniaturized and inexpensive.
  • a plurality of infrared transmitters are individually controlled with the aid of a drive unit, and as a result the infrared transmitters transmit individual signals in the form of focused narrow beam bundles into the detection space. It is provided that the individual infrared transmitters in a time sequence, which repeats itself cyclically, preferably circumferentially to drive. The time of one round is typically 0.1 to 2 seconds.
  • the projection surfaces of the radiation beams are focused on the image planes in such a way that they illuminate the areas characteristic of the identification of relevant scenes.
  • An infrared receiver detects almost all of the space irradiated by the beam and receives the reflected back from the room infrared radiation.
  • the signal sequence thus generated in the infrared receiver is stored in a memory.
  • the current signal sequence is compared either with the signal sequence of a static basic scene or with a reference scene acquired at an earlier time. But it is also a comparison with several already detected signal sequences or reference signal sequences possible. In this case, those individual signals of the signal sequences which are assigned to the same infrared transmitter are always compared with one another.
  • the individual signals emitted by the respective infrared transmitters are modulated.
  • a modulation to this modulation tuned receiver unit can be separated from each other in the receiver triggered signals that are either the infrared radiation of the environment, which usually has no modulation or the modulated individual signals.
  • the arrangement for carrying out the method has a plurality of infrared emitters arranged on at least one substrate, which are equipped with focusing optics, and has at least one infrared receiver, which is likewise provided with an optical system.
  • both the infrared transmitter and the infrared receiver are arranged on a substrate.
  • the infrared transmitters are connected to a drive unit with which the infrared transmitters are driven in accordance with the method.
  • the infrared receiver is connected to an evaluation unit, which serves to compare the currently detected signal sequence with reference signal sequences.
  • the infrared emitters and the associated optics are arranged and the optics are selected so that the projection surfaces of the radiation beams emitted by the infrared emitters lie in the image planes in such a way that they illuminate characteristic areas for the identification of a scene.
  • the infrared receiver and the associated optics are matched to one another in such a way that almost the entire space irradiated by the radiation beams is detected by the infrared receiver.
  • the infrared transmitters are designed as light-emitting diodes with integrated lenses, which are characterized by a comparatively small emission angle.
  • the spatial resolution is achieved by the spatially limited imaging (projection surfaces) of the infrared transmitters in the detection space and their sequential activation.
  • the temporal resolution is determined by the rotational frequency in the control of the individual infrared transmitters and their modulation frequency. If the scene changes in the detection space, ie reflected radiation signals of the respectively controlled infrared transmitter change in comparison to a basic scene or to the preceding signal sequence, this becomes clear from the signal difference between the circulations.
  • By synchronizing the signal sequence with the control of the infrared transmitter it is possible to separate the individual signals, which are each the same are associated with each other. In this way, the signal difference between signal sequences of at least two circulations can be assigned to defined spatial regions in the detection space and, if appropriate, a corresponding switching signal can be triggered.
  • location and time resolved scenes can be recorded in the detection space and stored as signal sequences. This makes it possible, on the one hand, to teach a static ground state in the detection area in which no switching signal is to be triggered. On the other hand, localized dynamic processes triggered by the switching signal (using a water jet in a certain area of the detection space) can be reliably detected and hidden or specially processed.
  • a particularly advantageous embodiment of the method according to the invention is achieved in that the beams of at least two different infrared transmitters intersect in a localized area in the detection space. If a moving object penetrates into this overlapping area of the beam bundles, this leads, with sufficiently fast circulations, to approximately the same relative signal change occurring in at least two optical channels within one revolution. In connection with the fixed geometrical arrangement of the optical channels of the individual infrared transmitters, it is thus possible to assign a location to the object in the detection area.
  • This embodiment of the method according to the invention makes it possible to define special, locally limited switching points in the detection space which can be used to control the overall system (eg arming the system).
  • FIG. 1 the schematic representation of an infrared transmitter and infrared receiver assembly for carrying out the method according to the invention is shown.
  • On the substrate 3a are a plurality of miniaturized infrared transmitter 3 with integrated optics 4 and aperture.
  • the infrared transmitters 3 have a defined emission character
  • These radiation beams 9 cause projection surfaces AH in an imaginary image plane 2a at a variable distance x from the infrared emitters 3.
  • an infrared receiver 5 with integrated optics 5a is located on the substrate 3a.
  • the opening angle 5b of the infrared receiver 5 is chosen so that it covers almost the entire space irradiated by the radiation beams 9 (corresponds to the detection space 2).
  • the infrared transmitter 3 are turned on successively in a selected direction of rotation 8a with a rotational frequency of a few cycles per second. During the switch-on of each infrared transmitter 3 this is operated with a pulse train of short individual pulses. Depending on the scene 1 in the detection space 2, which is shaped by objects 6 against a background, the radiation of individual radiation beams 9 is reflected in the direction of the radiation receiver 5 and generates at its output a signal voltage voltage sequence.
  • a corresponding time-dependent pattern of signal voltages at the output of the infrared receiver 3 which can be stored and analyzed via an adapted signal processing and evaluation software results.
  • a specific location in an image plane 2a of the detection space 2 can be assigned to each output signal over the course of time.
  • scenes 1 in the detection room trigger 2 switching signals, they can be taught in a teach-in process and stored as signal sequences. These signal sequences are then constantly compared with the signal sequences in real operation and trigger a match signal if they match within a predetermined range.
  • scenes can be identified in a spatially resolved manner by simple means of a temporal signal sequence.
  • a further advantage of the method is that detection areas in the image plane 2a, which cause permanent disturbances in the signal processing, can be masked out.
  • the method according to the invention will be described on the basis of its application for controlling the water flow of a water fitting on the sink.
  • FIG. 2 shows the schematic representation of the wash basin 12 and the water fitting 10 with the water outlet 13 as well as the spatial arrangement of the individual radiation beams 9 generated by the infrared transmitter and infrared receiver assembly 11 in the detection space 2.
  • Fig. 3 the resulting projection surfaces 15 of individual beams 9 are shown, which arise on the skin surface when two hands 14 are introduced into the detection space 2. From the projection surfaces 15 infrared radiation to the infrared transmitter and infrared receiver assembly 11 is reflected, which leads to a signal sequence at the output of the infrared receiver 5 due to the serial control of the individual infrared transmitter 3. By comparing these signal sequences with stored signal sequences, a switching signal for triggering the water flow is generated.
  • Fig. 5 shows the position of the projection surfaces AI of the infrared transmitter 3 in an image plane which is perpendicular to an imaginary optical axis of the infrared transmitter and infrared receiver assembly 11 and the sink edge cuts (see Fig. 2).
  • Fig. 6 the relative height and the timing of the signal level at the output of the infrared receiver are shown qualitatively, resulting from reflected radiation of the individual beam 9.
  • the signals of the radiation beams GI are higher than those of the radiation beams AF, since they are reflected by the washbasin inner surface at a relatively short distance.
  • This signal sequence can be defined as a basic scene, since it is determined only by the specific structures and environmental conditions in the detection space and hardly changes over time.
  • FIG. 7 shows the position of the projection surfaces A-I of the infrared transmitter 3 in an image plane in the region of the finger surface after the introduction of two hands into the detection space 2 (see FIG. 3).
  • FIG. 8 qualitatively shows the now resulting signal sequence at the output of the infrared receiver 3. The clear changes in the relative signal height in the regions C-H lead to a triggering of the water jet 16.
  • FIG. 9 shows the position of the projection surfaces A-I of the infrared transmitter 3 in an image plane in the region of the surface of the water jet 16 and
  • FIG. 10 shows the signal sequence at the output of the infrared receiver 3.
  • the lying on the radiation surface projection surfaces B, E, H generate in several rounds strongly fluctuating signal levels, so that a clear signal evaluation is difficult.
  • the scene can be clearly identified (see Fig. 6,8,10).
  • Fig. 11 shows the schematic representation of the application of the method according to the invention with intersecting radiation beams.
  • the signal sequence shown in FIG. 12 results for the selected beam bundles.
  • the irradiation with the beam bundles B and X produces approximately the same output signal.
  • This state can be used with appropriate geometric arrangement of the additional infrared transmitter X for arming the system or as distance information.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Electromagnetism (AREA)
  • Remote Sensing (AREA)
  • General Physics & Mathematics (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Geophysics And Detection Of Objects (AREA)
  • Optical Radar Systems And Details Thereof (AREA)

Abstract

L'invention concerne un procédé et un système pour identifier des scènes dans un espace de détection au moyen d'un rayonnement infrarouge, de préférence en vue d'une utilisation comme détecteur de proximité pour la commande automatique de l'écoulement de l'eau dans des robinetteries de lavabos. À cet effet, des signaux sont émis par plusieurs émetteurs infrarouges individuels (3) dans l'espace de détection (2), de préférence selon une séquence temporelle répétée de façon cyclique, sous forme de faisceaux de rayons étroits focalisés (9) et la lumière infrarouge réfléchie est captée par au moins un récepteur infrarouge (5). La séquence de signaux ainsi produite au niveau du récepteur infrarouge (5) est comparée au moyen d'un dispositif d'évaluation (7) avec la séquence de signaux d'une scène de base statique et/ou avec des séquences de signaux détectées antérieurement pour des scènes de référence, les signaux individuels de la séquence de signaux produite actuellement et des séquences de signaux de référence qui sont associés au même émetteur infrarouge (3) étant comparés les uns avec les autres. Le procédé selon l'invention est adapté en particulier à des détecteurs de proximité devant fonctionner dans des conditions sévères.
EP08848121.3A 2007-11-06 2008-11-06 Procédé et système pour identifier des scènes dans un espace de détection Active EP2207937B8 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007052700A DE102007052700A1 (de) 2007-11-06 2007-11-06 Verfahren und Anordnung zur Identifikation von Szenen in einem Erfassungsraum
PCT/DE2008/001811 WO2009059587A1 (fr) 2007-11-06 2008-11-06 Procédé et système pour identifier des scènes dans un espace de détection

Publications (3)

Publication Number Publication Date
EP2207937A1 true EP2207937A1 (fr) 2010-07-21
EP2207937B1 EP2207937B1 (fr) 2014-03-19
EP2207937B8 EP2207937B8 (fr) 2014-06-11

Family

ID=40456813

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08848121.3A Active EP2207937B8 (fr) 2007-11-06 2008-11-06 Procédé et système pour identifier des scènes dans un espace de détection

Country Status (3)

Country Link
EP (1) EP2207937B8 (fr)
DE (1) DE102007052700A1 (fr)
WO (1) WO2009059587A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI123072B (fi) * 2009-05-26 2012-10-31 Oras Oy Nesteenjakelulaitteisto
US9032565B2 (en) 2009-12-16 2015-05-19 Kohler Co. Touchless faucet assembly and method of operation
DE102014109304A1 (de) 2014-07-03 2016-01-07 Münchner Hybrid Systemtechnik GmbH Verfahren zum steuern einer armatur und betätigungsvorrichtung für eine armatur
DE102017118370A1 (de) * 2017-08-11 2019-02-14 Grohe Ag Sanitärarmatur mit zumindest einem Sensor zur Erfassung eines Qualitätsparameters einer Reinigung eines Körperteils

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Publication number Priority date Publication date Assignee Title
IL105133A0 (en) * 1993-03-22 1993-07-08 Madgal Glil Yam Electronically operated faucet including sensing means
US5978401A (en) * 1995-10-25 1999-11-02 Honeywell Inc. Monolithic vertical cavity surface emitting laser and resonant cavity photodetector transceiver
DE19744319A1 (de) 1996-10-08 1998-04-23 Megamos F & G Sicherheit Vorrichtung zum Überwachen von Räumen gegen unbefugten Eintritt
TW402856B (en) * 1996-12-26 2000-08-21 Palite Corp LED illuminator
DE19721105C5 (de) 1997-05-20 2008-07-10 Sick Ag Opto-eletronischer Sensor
WO1999004283A1 (fr) 1997-07-18 1999-01-28 Kohler Company Installations de plomberie sophistiquees activees sans intervention manuelle
US6169295B1 (en) * 1998-05-29 2001-01-02 Maxim Integrated Products, Inc. Infrared transceiver module and method for making same
JP3420079B2 (ja) 1998-09-29 2003-06-23 松下電器産業株式会社 状態検知システム
JP2001078906A (ja) * 1999-09-16 2001-03-27 Uro Electronics Co Ltd 自動水栓
DE10162723A1 (de) 2001-12-19 2003-07-10 Fachhochschule Hannover Verfahren und Vorrichtung zur Erfassung von Objekten
US20070094787A1 (en) 2005-11-02 2007-05-03 Hydrotek Corporation Multiple-electric-eye induction faucet

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Also Published As

Publication number Publication date
DE102007052700A1 (de) 2009-05-07
EP2207937B8 (fr) 2014-06-11
EP2207937B1 (fr) 2014-03-19
WO2009059587A1 (fr) 2009-05-14

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